Method, system and gateway device for enabling interworking between IP and CS networks

Abstract

A method, system and gateway device enables interworking between an IP-based network and a circuit-switched network. A first address information of a first connection end located in the circuit-switched network is routed in a trigger message from the IP-based network to a gateway control function. The first and second call legs are established in parallel towards the first connection end based on the first address information, and towards a second connection end located in the IP-based network based on a second address information obtained from the trigger message. A single connection between the two connection ends is then established by connecting the first and second call legs. Thereby, IP-based signaling functionality can be used to add capability for subscribers located in the CS domain to be invited into conferences or calls with subscribers located in an IP-based domain, e.g. the IMS domain.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority of U.S. Provisional Application Ser. No. 60 / 456,953 entitled, “Method, System and Gateway Device for Enabling Interworking Between IP and CS Networks,” filed Mar. 25, 2003, the entire contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a method, system and gateway device for enabling interworking between an Internet Protocol (IP) network, such as an IP Multimedia Subsystem (IMS) network, and a circuit-switched (CS) network, such as a Global System for Mobile Communication (GSM) network.[0004]2. Description of the Related Art[0005]In order to achieve access independence and to maintain a smooth interoperation with wired terminals across the Internet, an IP multimedia subsystem (IMS) core network as specified e.g. in the 3GPP (Third Generation Partnership Project) specification TS 23.228 has been developed to ...

AI Technical Summary

Benefits of technology

[0017]Accordingly, IP-based signaling functionality can be used to add capability for subscribers located in the CS domain to be invited into conferences or calls with subscribers located in an IP-based domain, e.g. the IMS domain. The interworking can be achieved by establishing two parallel connections or call legs and connecting these call legs to a single session or connection between the circuit-switched network and the IP-based network.

Problems solved by technology

However, interworking between IMS and CS domains and between SIP-based conferencing and CS domains has not been considered yet.

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